Two 35-inch pumps from the figure (a) shown below are installed in parallel for the system of the figure (b) shown below. Neglect minor losses. For water at 20°C, take ρ = 1.94 slug/ft3 and μ = 2.09E−5 slug/ft⋅s. For cast iron, ε ≈ 0.00085 ft. 1) Estimate the flow rate and power required if both the pumps are running.  Q = ? in gal/min P = ? bhp   2) Estimate the flow rate and power required if one pump is shutoff and isolated. Q = ? in gal/min

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Two 35-inch pumps from the figure (a) shown below are installed in parallel for the system of the figure (b) shown below. Neglect minor losses. For water at 20°C, take ρ = 1.94 slug/ft3 and μ = 2.09E−5 slug/ft⋅s. For cast iron, ε ≈ 0.00085 ft.

1) Estimate the flow rate and power required if both the pumps are running. 

Q = ? in gal/min

P = ? bhp

 

2) Estimate the flow rate and power required if one pump is shutoff and isolated.

Q = ? in gal/min

P = ? bhp

1 statute mile
of cast iron pipe,
Two pumps
figure (b)
Transcribed Image Text:1 statute mile of cast iron pipe, Two pumps figure (b)
n = 710 r/min
400
NPSH
25
350 – 413-in dia.
300
10
38-in dia.
250 – 35-in dia.
86%.
200
84%
150
100
4
8
12
16
20
24
28
U.S. gallons per minute x 1000
(b)
NPSH, ft
%88•
1500 bhp
1250 bhp
%88
%98.
1000 bhp
84%
%08
Total head, ft
Transcribed Image Text:n = 710 r/min 400 NPSH 25 350 – 413-in dia. 300 10 38-in dia. 250 – 35-in dia. 86%. 200 84% 150 100 4 8 12 16 20 24 28 U.S. gallons per minute x 1000 (b) NPSH, ft %88• 1500 bhp 1250 bhp %88 %98. 1000 bhp 84% %08 Total head, ft
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